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(No Model.)

N. BUTLER. ORE GONGENTRATOR. N0.'317,621. Patented MajlZ, 1886.

UNITED STATES PATENT OFFICE.

NORMAN BUTLER, OF ENNISS, MONTANA TERRITORY.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 317,621, dated May 12, L885.

Application filed July 21,1884. (X0 model.)

To all whom it may concern.-

Be it known that I, NORMAN BUTLER, of Enniss, county of Madison, and Territory of Montana, have invented an Improvement in Ore-Concentrators; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to a new and useful ore-concentrator of that class in which the ore pulp is deposited upon shaking-tables, whose motion separates the particles of different specific gravities; and my invention consists in the combination of devices hereinafter described and claimed.

The object of myinvention is to provide a simple and effective ore-concentrator.

Referring to the accompanying drawing, the figure is a perspective view of my concentrator.

A is a frame, from the top bar, a, of which is suspended, by means of the hangers b, the upper table, B, which has a downward incli-' nation toward the rear of the machine. From this table is suspended, by means of hangers c, the lower table, 0, having a downward inclination toward the front. To these tables may be imparted either a transverse or a longitudinal shake by the means I shall describe, though I have here shown these means as adapted to give the table a longitudinal or end shake.

D is a crank-shaft, having pulley (Z, to which suitable power can be applied.

E is a connecting-rod, joining the crank of shaft D with a bearing block or car secured to the under surface of the upper table near its rear end. A positive motion is thus given to said upper table, and the lower one follows its motion in a kind of swinging movement owing to its pivoted hangers.

The surface of the upper table is provided at its forward end with a basin, 1), from which extends rearwardly the channel or run I)", the walls of which are perpendicular. Upon each side of the channel b are the channels If, each having a sloping bottom inclining downwardly to the sides, a closed forward end, and

open rear end.

The rear end of the lower table projects beyond the vertical plane of the rear end of the upper table, whereby it is adapted to receive the pulp from above, and this lower table is provided with three parallel runs or channels, the one 0 being the central one, and those a being the side ones, the former being adapted to receive the pulp from the channel b above, and the latter to receive it from the channels I)". In these channels of the lower table are the amalgamated copper plates F, designed to catch the free gold.

Gis a stirrer, consisting of suitable prongs, extending within channel b and a head, to which the prongs are attached. This stirrer is secured by an arm, g, to the top bar, a, of

frame A.

Mounted in the front of frame A, just over the forward end of the upper table, is a cylinder, H, which is made of material having original or imparted magnetic properties, according to whether made of magnetic iron or magnetized or electro magnetized iron. I prefer to make it of iron, either magnetic in the first place or properly magnetized, though it could be suitably constructed to become an electromagnet.

I is afeed-chute, supported by frame A, and communicating with said cylinder a little be yond its top center, to carry the pulp over it and down upon the upper table.

J is a rubber strap or band touching lightly just under said band and supported by the frame.

L is the pulley to which power is applied to rotate the cylinder H, the direction of whose rotation is indicated by the arrows.

The operation of my machine is as follows: The ore, with water from pipe M, is fed into chute I, by which the pulp is directed upon the rotating cylinder H, by which it is carried around and discharged into basin b of table B. Whatever iron particles may be in the pulp cling to the magnetic cylinder, and are carried under and up by it until scraped. off by the rubber band or scraper, when they fall into chute K, and are discharged clear of the machine. The pulp, together with rnore water supplied through pipe M, runs from the basin into channel I)", and being in a constant state of agitation and stirred up by. the prongs of the stirrer G, the heavier and precious particles sink to and remain at the bottom. The

the surface of the cylinder, and K is a chute lighter and worthless particles'flow over the edges of channel b into side channels, b, whose outwardly-sloping bottoms induce this separation and afford at their lower edges places for the heavier particles which come over with the'lighter, and the upper edges are kept clear for the passage of more light tailings from the central channel. At the rear end of the table the concentrations from the central channel and the few concentrations and gangue from the side channels drop down into, the channels 0 0 immediately below, where the free gold is caught by the copper plates, and the concentration stillgoes on, the pulp passing forward to the discharge.

It is obvious that though I have shown but two oppositely-inclined tables, I could increase the series to any desirable number; but I prefer to have but two, as they accomplish the result satisfactorily.

Having thus described my invention, what I claim as new, and desire to secure by Letters I Patent, is

1. In an ore-concentrator, the frame A, the upper inclined table provided with longitudinal channels I) and b, suspended from said frame by links I), and the lower oppositely-inclined table suspended by links 0 from the upper table, and adapted to receive its charge on its head from the foot of the upper table, in combination with the crank-shaft D and i rod E, connecting the crank-shaft with the 1 upper table, substantially as herein described.

2. In an ore-concentrator, the suspended; and vibrating inclined table B, having the i basin b at its head, the central 'run or channel, b communicating with said basin, and the independent side runs or channels, b having outwardly-sloping bottoms, substantially as herein described. I

3. In an ore-concentrator, the suspended and vibrating inclined table B, having the basin 1/, the central run or channel, b", and independent side runs or channels, h in combination with the oppositely-inclined vibrating table 0, suspended under the upper table, and adapted to receive on its head the charge from the foot of said upper table, and having the independent parallel runs or channels 0 0" under the runs of the upper table, substantial] y as herein described.

4. In an ore-concentrator, the suspended and vibrating inclined table B, having the central run or channel, If, and the side runs, 1), in combination with the stationary stirrer G, operating in the central run, substantially as herein described.

5. In an ore-concentrator, the frame A and vibrating tables B and G, as described, in combination with the rotating feed-cylinder H, mounted in said frame over the head of the table B, and a stationary stirrer, substantially as herein described.

In witness whereof I have hereunto set my 1 hand.

NORMAN BUTLER.

Witnesses:

JAMEs MoALLisTER, E. R1. STILEs. 

